Means for effecting telephonic communication without connecting-wires.



H. G. MATTHEWS. MEANS FOB EFFEOTING TELEPHONIC COMMUNICATION WITHOUTGONNEGTING WIRES.

' I APPLICATION FILED JUNE 18. 1910.

977,462. Patented Dec. 6, 1910.

a D/WM i ff" HARRY GRINDELL MATTHEWS, .OF GLOUCESTER, ENGLAND.

MEANS FOR .EFFECTING' TELEPHONIC COMMUNICATION WITHOUT CONNECTING-WIRES.

Specification of Letters Patent.

Patented Dec'. 6, 1910.

Application led June 18, 1910. Serial No. 567,637.

To all 'whom 'it may concern:

Be it known that I, HARRY GRINDELL I' MATTHEWS, subject of the King ofGreat Britain, residing at Friezwood-Rudgeway, Thornbury R. S. O.,Gloucester, England, have invented new and useful Improved Means forEffecting TelephonicCommunication Without Connecting-Wires, of which thefollowing is a specification.

This invention relates to improved means for effecting speechcommunication by means of emitting and receiving instruments without theaid of connecting wires, the installation being of a portable character.

TheA means for edecting the emission o the wirelessly conveyableelectrically produced vibrations comprise a hollow frame which may be ofany convenient shape, circular, square, oblong or other .closed ligure.This frame is adapted to carry, distributed around its periphery, .aplurality of bundles of wires which preferably are magnetized steel, thelengths of which are disposed in the direction perpendicular to theplane of the frame with like poles pointing all in one direction, theseveral bundles being electrically insulated from.each other.

Around the frame is Wound a continuous coil of many convolutions ofinsulated wire which may be wound within or may be wound outside thebefore-mentioned bundles of wire. Arrangements are made whereby, when itis desired to send a message, there can be switcliedinto circuit withthe said coil, a battery or accumulator, a telephone transmitter, aknown device to be presently described, whereby the battery current isrendered intermittent to an extremely high degree of frequency withoutdefinite periodicity, an ammeter and a reinforcing device to bepresently described and, alternatively, the battery, transmitter, &c.,can be switched out of the circuit, and a tele hone receiver and relayswitched into the circuit with the said coil when it is desired that amessage be received. Preparatory to receiving the message, the circuitmay be made to include any aural, visual or other attention directingdevice arranged to be invoked by a relay battery. Alternatively theattention calling device may consist of a telephone receiver adapted toemit a sound audible at some distance.

The known intermitter of excessively high frequency comprises a pair ofsurfaces which are caused' to travel relatively to one another -at acomparatively low velocity, the electric current being required to passfrom one suru face to the other'.

sistance to the passa-ge of the electric `rurrent, and 1t is also suchthat the frictional contact of the rubbing surfaces causes a momentarybreakdown of resistance, the resulting passage of an electric impulsere-constituting the resistance. This effect occurring at a multiplicityof points causes the electric `flow to be intermittent with such a highdegree of frequency and with such an indefiniteness of periodicity thatthe voice waves produced in the telephone transmitter are able toinitiate by means of the frame, wirelessly conveyable vibrationspossessing the same voice character.

The periphery of a disk of aluminium and a steel shoe which fits theperiphery, constitute a pair of surfaces which is adapted to effect thehigh frequencyv intermittence above described. f

The reinforcing device above referred to, which is included in thetransmitting circuit,

The character of the sur? faces is such as to normally interpose a re-.

consists of a plurality of coils o f insulated A wires wound on bundlesof iron wire, arrangements being made whereby a greater or less numberof such coils can, with facility be switched into the circuit. These mayconsist of a plurality of coils surrounding a `single bundle of wirescommon to them all or, alternatively, each coil maybe separatelyfurnished with a core of wires.

AOn the accompanying drawing is shown an arrangement of the abovedescribed elements whereby speech can be transmitted to 4 or alternatelyreceived from a distance as desired without the use of interconnectingwires.

In this drawing, a is a frame of portable dimensions which performs thevfunction of .the so called aerial of ordinary wireless systems oftelephony. Around the periphery of this frame are Secured a plurality ofbundles al al of steel wires which have been inagnetized and placed withlike poles pointing all in one direction, such direction beingperpendicular to the central pointed as nearly as can be ascertained inthe direction of the station with which communication is desired. l

Around the frame an insulated wire a2 is Wound a plurality of times, thecoil being within or without the bundles of wires. This coil forms aportion of the circuit of the transmitter, when a message is being sentor, alternatively, a portion of the receiving circuit on the receptionof a message.

In the transmitting circuit is included a source of electric energy b,which may conveniently be an accumulator.

At c is shown a high frequency interrupter of the character abovedescribed, consisting for vexample of a disk ofaluminium 01 so mountedand so actuated that it undergoes slow rotation by clock-work,electro-motive Y power or otherwise. In light adjustable contact withthe periphery of the disk is a shoe 02. c Y

The electric impulses transmitted are required to cross some point ofthe space which intervenes between the shoe 02 and the disk c1, thatpoint being situated anywhere on the more or less contacting surfaces ofc1 and c2.

At d is a reinforcer consisting of a plurality of wire coils d1 d1 woundon bundles of iron wires, the coils bein so interconnected to oneanother and to t e contacts d2 (Z2 that by shifting the switch arm d3any number of the coils may be in eluded in the circuit as desired. Y

At e is a microphone or telephonic trans- Y mitter adapted to receivespeech and translate it into corresponding electric impulses. An ammeterf is shown included in or associated with the transmitting circuit.

The circuit is completed throu h a key or switch g when pressed.Alternatively, when the key is not pressed the accumulator b andtheabove described transmitting instrumentsc d e fare cut out of theclrcuit of the wire a2 wound around the frame a and the circuit aroundthe latter is completed through the winding of a telephone receiver h,this latter being supplemented by a relay of ordinary construction h1.

I claim:

1. For emitting and receiving electrically produced vibrationsconveyable therefrom or thereto in a wireless manner, a frame,comprising a plurality of bundles of wires of ma netizable materialsecured around the periphery of the frame with the lengths of the wiresplaced in a direction at right angles to the central plane of the frame,a wire wound around said frame and means for transmitting electricimpulses of a sig- Y naling character through the said wire.

2. For emitting and receiving electrically produced vibrationsconveyable therefrom or thereto in a wireless manner, a frame,comprising a plurality of bundles of magnetized steel wires securedaround the periphery of the frame with the lengths of the Wires placedin a direction at right angles to the central plane of theframe, a wirewound around said frame and means for transmitting electric impulses, ofa signaling character through the said wire.

3. An emitter of wirelessly conveyable vibrations comprising a framehaving secured around t e eriphery thereof a pluralit of bundlesof)wires and having a conductlng wire wound around said frame, a sourceof electric energy, a telephone transmitter and a high frequencyinterrupter in circuit with the said frame-wound wire.l

4. An emitter of wirelessly conveyable vibrations comprising a framehaving secured around the periphery thereof a plurality of bundles ofmagnetized steel wires and having a conducting wire wound around saidframe, a source of electric energy, a telephone transmitter and a highfr uency interrupter in circuit with the said ramewound wire.

5. An emitter of wirelessly conveyable vibrations comprising a framehaving secured -around the periphery thereof avplurality of bundles ofmagnetized steel wires and having a conducting wire wound around said'yframe, a source of electric energy, a telephone transmitter and a highfrequency non-periodic interrupter in circuit with the said frame-woundwire, said interrupter comprising a pair of surfaces in moving contact,the nature of which is such as to mterpose a resistance to thecross-flow of electricity, which resistance breaks down by the relativemovement of the surfaces and is renewed by the passage of electricity.

6.- An emitter of wirelesslyconveyable vibrations, comprising a frame',a plurality of bundles of magnetized steel wires sevcured to theperiphery of the frame with their lengths 1nv a direction at rightangles to the plane of the frame, a conducting wire wound around saidframe and in circuit therewith, a source of electric energy,telephone'transmitter, a high frequency interrupter, and a plurality ofcoils, embracing bundles of iron wires.

7. A telephonic installation for wirelessly conveyed intercommunication,comprising a pair of frames situated in approximately parallel planes, alurality o bundles of wires of magnetiza le material secured to eachframe, a conducting wire wound around Y each frame, a source ofelectricit a telephone transmitter and a high requency transmitter incircuit with the wire of one frame and a telephone receiver with thewire of the other frame.

8. A telephonic installation for wirelessly I conveyedintercommunication, comprising a pair of frames situated in aproxunately parallel planes, a plurality o bundles of wires ofmagnetizable material secured to the receiving tele hone in circuit Withthe each frame, a conducting wire wound around frame-wound con( uctingWire. 10

cach frame, and in association with each In Witness whereof I havehereunto set my frame a combination of a source of elechand in presenceof two witnesses'.

tricity, a telephone transmitter and a high- H. GRINDELL MATTHEWS.frequency interrupter and also a telephone \Vitn'esses: A receiver andin addition a switch adapted to R. NVILLIAMS,

place either the transmitting combination or H. D. JAMESON.

